From a486c46aec23b62857d861485dfa842cade30236 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Sat, 11 Jun 2011 22:27:09 +0000 Subject: [PATCH] l2tp: fix l2tp_ip_sendmsg() route handling l2tp_ip_sendmsg() in non connected mode incorrectly calls sk_setup_caps(). Subsequent send() calls send data to wrong destination. We can also avoid changing dst refcount in connected mode, using appropriate rcu locking. Once output route lookups can also be done under rcu, sendto() calls wont change dst refcounts too. Signed-off-by: Eric Dumazet CC: James Chapman Signed-off-by: David S. Miller --- net/l2tp/l2tp_ip.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c index b6466e71f5e1d..d21e7ebd91ca5 100644 --- a/net/l2tp/l2tp_ip.c +++ b/net/l2tp/l2tp_ip.c @@ -480,18 +480,16 @@ static int l2tp_ip_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *m if (connected) rt = (struct rtable *) __sk_dst_check(sk, 0); + rcu_read_lock(); if (rt == NULL) { - struct ip_options_rcu *inet_opt; + const struct ip_options_rcu *inet_opt; - rcu_read_lock(); inet_opt = rcu_dereference(inet->inet_opt); /* Use correct destination address if we have options. */ if (inet_opt && inet_opt->opt.srr) daddr = inet_opt->opt.faddr; - rcu_read_unlock(); - /* If this fails, retransmit mechanism of transport layer will * keep trying until route appears or the connection times * itself out. @@ -503,12 +501,20 @@ static int l2tp_ip_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *m sk->sk_bound_dev_if); if (IS_ERR(rt)) goto no_route; - sk_setup_caps(sk, &rt->dst); + if (connected) + sk_setup_caps(sk, &rt->dst); + else + dst_release(&rt->dst); /* safe since we hold rcu_read_lock */ } - skb_dst_set(skb, dst_clone(&rt->dst)); + + /* We dont need to clone dst here, it is guaranteed to not disappear. + * __dev_xmit_skb() might force a refcount if needed. + */ + skb_dst_set_noref(skb, &rt->dst); /* Queue the packet to IP for output */ rc = ip_queue_xmit(skb, &inet->cork.fl); + rcu_read_unlock(); error: /* Update stats */ @@ -525,6 +531,7 @@ out: return rc; no_route: + rcu_read_unlock(); IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); kfree_skb(skb); rc = -EHOSTUNREACH; -- 2.39.5